Love the idea I stopped at wave 11 I think 665 points
I would have loved the ability to take my cannon layout with me and not to rebuild it everytime.
I like the cool down aspect of the canons and the different typs though the buckshot I never use after the first try. you just have to be careful not to overlap cannons otherwise you cant tell the cooldown because you cant see the barrels. For the later levels - backrow with heavy canons and sniper and slightly infront 3 normal canons - you can add 2 walls to each side and focus on the heavy and sniper for multikills and the normal cannons for single targets that are getting close ;-)